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Method for leaching positive pole material of waste lithium nickelate battery

A technology for lithium nickelate waste batteries and cathode materials, which is applied in the direction of improving process efficiency, can solve the problems of uneconomical self-use of industrial pure oxygen, complicated leaching equipment, and small amount of industrial pure oxygen, etc., and achieves obvious economic benefits and environmental protection. Benefit, reduce pollution control costs, improve the effect of metal leaching rate

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrochloric acid leaching method, equipment corrosion, large amount of acid mist and environmental pollution
Sulfuric acid leaching consumes more expensive reducing agents (such as hydrogen peroxide, etc.), and the leaching speed is slow and the acid consumption is high
The consumption of nitric acid in the nitric acid leaching method is large, and a large amount of nitrogen oxides will be produced, polluting the environment
All wet processes have the problem of how to economically increase the leaching speed, increase the metal leaching rate, and reduce the consumption of acid and other auxiliary materials.
Although the pure oxygen leaching method in the nitric acid processing industry and the pure oxygen leaching method in the mixed acid processing industry have solved the above problems, the leaching equipment is more complicated, and the amount of industrial pure oxygen required for the leaching of waste batteries is not large, and waste battery treatment enterprises produce on-site Industrial pure oxygen is not economical for personal use, and the storage, transportation and use of industrial pure oxygen are troublesome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Add 100g of lithium nickelate waste battery positive electrode material (containing 54.3% nickel, 5.5% lithium, 7.8% copper, 3.1% aluminum) and 30g of sawdust ≤ 1.5mm into a titanium-lined pressure reactor with a volume of 2L, and add 1300ml of mixed acid solution with a sulfuric acid concentration of 1.5mol / L and a nitric acid concentration of 5g / L was stirred at 60°C to 70°C (stirring speed 80r / min) for 4.0h, and liquid-solid separation was performed after leaching to obtain 1250ml of leaching solution (excluding leaching slag washing water). The leaching rates of nickel, lithium, copper, and aluminum are 98.9%, 99.1%, 98.3%, and 98.6% (calculated based on the nickel, lithium, copper, and aluminum entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0019] Example 2: Add 500g of lithium nickelate waste battery positive electrode material (containing 54.3% nickel, 5.5% lithium, 7.8% copper, 3.1% aluminum)≤1.5mm sawdust 190g into a titanium-lined pressure reactor with a volume of 5L, and add sulfuric acid 3200 ml of mixed acid solution with a concentration of 3.5mol / L and a concentration of nitric acid of 10g / L was stirred at 70°C to 80°C (stirring speed 70r / min) for 2.0h, and liquid-solid separation was carried out after leaching to obtain 3000 ml of leaching solution (excluding leaching slag washing water). The leaching rates of nickel, lithium, copper and aluminum are 99.2%, 99.5%, 99.0% and 98.9% respectively (calculated based on nickel, lithium, copper and aluminum entering the leaching solution and leaching slag washing solution).

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Abstract

The invention discloses a method for leaching a positive pole material of a waste lithium nickelate battery. The method comprises the steps of adding the positive pole material which is separated from the waste lithium nickelate battery and is subjected to roasting pretreatment, and wood sawdust into a reaction kettle which is resistant to pressure and the corrosion of sulfuric acid and nitric acid, adding a mixed solution of sulfuric acid and nitric acid, and leaching while stirring under closed conditions.

Description

technical field [0001] The invention relates to a method for leaching the cathode material of lithium nickelate waste batteries. Background technique [0002] Lithium nickel oxide battery is a kind of widely used battery, and a large amount of waste batteries will be produced after the battery is scrapped. Because this type of battery contains a large amount of heavy metals, if it is discarded into the environment, it will cause great direct and potential harm to the environment. The positive electrode material of lithium nickelate waste batteries mainly contains nickel, lithium, copper and aluminum, and the total content of nickel, lithium and copper is more than 60%, which is very valuable for recycling. At present, the processes for recovering nickel, lithium and copper from the positive electrode materials of lithium nickelate waste batteries mainly include fire process and wet process. The products obtained by the fire process are alloy materials, and it is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B3/06C22B15/00C22B21/00C22B23/00C22B26/12
CPCY02P10/20
Inventor 龙炳清林春李贵
Owner SICHUAN NORMAL UNIVERSITY
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